What i feel is that since that girl asked demon to transform her soul to the prettiest person, in this case ml, because he’s so powerful demon couldn’t do that and the soul went to nearest body, that is latte, just my predictions
If I remember well I think it was that 'the most beautiful woman' would be the one loved by the most beautiful man in that demon's logic and since Arwin is the most beautiful man, the girl was put in Latte's body
What i feel is that since that girl asked demon to transform her soul to the prettiest person, in this case ml, because he’s so powerful demon couldn’t do that and the soul went to nearest body, that is latte, just my predictions